How to display a list inside another list in a Winfoms DataRepeater

Question

I am using C# Windows Forms and a codefirst database (Visual Studio 2013 Ultimate).

Is it possible to display a list inside another list in Windows Forms? (The emphasis is on -displaying- the data).

Please see this project as an example: https://postimg.cc/image/inunj8pxh/

I usually display a list with powerpacks´ datarepeater. For example when an order is placed by a customer, I can display the orderId, customerEmail, customerName etc. of the list of orders.

However, each order includes many different items. So far, I am not able to display any elements of the child-list (items) inside each element the datarepeater, where the parent-list (orders) is shown. The foreign-key of each item is the orderId, and the foreign-key of the order is the list of items (relationship order...items is 1..n).

Answer 1

I found the solution! It took me a while to figure out how to gain control over datarepeater items. Reading across many other forums and tutorials, I gradually worked my way through. Find in the screenshot my complete project: https://i.sstatic.net/jFa7G.png

Any improvements in the code are more than welcome. Since I am quite new to the whole programming world, my code may not be optimized and the use of vocabulary may sometimes be inaccurate.

Here you find the code of my Form1:

namespace list_inside_list
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {


    }

    protected override void OnLoad(EventArgs e)
    {
        //First we load the list of Orders to datarepeater1
        Program.CompanyContext _context = new Program.CompanyContext();
        List<list_inside_list.Program.Order> listOrders = _context.Order.ToList();
        program_OrderBindingSource1.DataSource = listOrders;

        //I don´t know why, but we need to load the list of items as well, although we never use the listItems variable
        List<list_inside_list.Program.Item> listItems = _context.Item.ToList();


        /* 
         * 1. We will loop through all the datarepater1 items (which is fed with listOrders)
         * 2. We assign currItem as datarepeater1.CurrentItem in order to "select" the current item at index j,
         *    although we will never user currItem
         * 3. We tell the program that of the current datarepeater item we want use the current Order object
         * 4. We go through each of the currentOrder.items and print the itemName
         * 
        */

        DataRepeaterItem currItem = new DataRepeaterItem();
        for (int j = 0; j < this.dataRepeater1.ItemCount; j++)
        {
            this.dataRepeater1.CurrentItemIndex = j;
            currItem = dataRepeater1.CurrentItem;               
            var currentOrder = (list_inside_list.Program.Order)program_OrderBindingSource1.Current;
            foreach (var item in currentOrder.items)
            {
                dataRepeater1.CurrentItem.Controls["richTextBox1"].Text 
                    = dataRepeater1.CurrentItem.Controls["richTextBox1"].Text + item.itemName + "\n";
            }

        }
    }
}

}